<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
  <title>Page Title</title>
  <style>
    body {
      margin: 0;
      padding: 0;
    }
  </style>
</head>
<body>
  <div id="app"></div>
  <!-- <script>
    document.documentElement.style.fontSize = document.documentElement.clientWidth / 7.5 + 'px'
  </script> -->
</body>
</html>